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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d492d3499b9f9b4e621114e4a79d906c43ac3a4b5f41cf8aaf3ada013bfbe9' 
  AND token = 'gjg2ttdvabZO+CvfH69UgQRmZ77vrgi9Es1O6QA8muY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}